a. (UN-1 7 b.)
1799. Southey, in Sir H. Davy’s Rem. (1858), 37. One channel,… unbridgeable from its depth, unpassable from its whirlpools.
1879. Lewes, Study Psychol., 50. An unbridgeable gulf, which no dexterity of speculation can pass.
1881. Standard, 30 Aug., 3/4. Between them there was an all but unbridgeable abyss.
